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mm/page_alloc: keep a zone's pagesets when it goes empty
When offlining empties a zone, zone_pcp_reset() frees its pagesets while the vmstat worker can still hold one across cond_resched(): CPU 0 CPU 1 refresh_cpu_vm_stats()
When offlining empties a zone, zone_pcp_reset() frees its pagesets while the vmstat worker can still hold one across cond_resched(): CPU 0 CPU 1 refresh_cpu_vm_stats()